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Cells and Heredity (Dominant and Recessive Alleles (Some alleles are…
Cells and Heredity
Dominant and Recessive Alleles
Traits are controlled by factors called genes
Each pea plant has one allele from each of it's parents
They can have of of each allele or two of the same
Some alleles are dominant while some are recessive
A dominant trait always shows up when the allele is present
Whenever the dominant allele is present, the recessive allele is hidden
A recessive trait only shows up when both alleles are recessive
A hybrid is when an organism has a trait from two different alleles
A hybrid is an organism that is heterozygous
Dominant alleles are represented with a capital letter and recessive are marked by a lowercase letter
People used to think that the two alleles/traits would produce a mixed offspring
Mendel proved that wrong by crossing the pea plants
He wasn't recognized for his work until 1900 and he was then named the father of genetics
Definitions and Mendel
Heredity is the passing of characteristics from parent to offspring
Genetics are the study of heredity
Mendel wondered about the different characteristics of pea blossoms
Traits are the different forms of characteristics
Mendels Experiments
Crossing Pea Plants
A purebred organism is the offspring of many generations that have the same trait.
An example is purebred short pea plants always come from short parent plants.
Alleles in mendels crosses